Interaction refers to communication between individuals, particularly when negotiating meaning to prevent breakdowns. Research shows that conversational interaction facilitates language acquisition by connecting input, internal learner capacities like attention, and output. It is important to keep learners active in the classroom by reducing teacher talk and increasing learner talk time. Effective interactions involve exchanging information, having a specific outcome, including details, and focusing on problems using natural conversation and narratives. Ways to apply this research in the classroom include giving students opportunities to interact with the teacher and each other, planning instruction with tasks that promote interaction, and teaching language in the context of meaningful activities.